Timer



Oct. 30, 1923.

I 1,472,180 I H. G. LORENSON TIMER Filed Feb. 14. 1921 Effw-ney a at theend of the reduced shaft.

Patented Oct. 30, 1923.

UNITED I STATES HARRY enonen LORENSON, or NEWMAN, CALIFORNIA.

TIMER.

Application filed February 14, 1921. Serial No. 444,943.

A To all whom it may concern:

Be it known that I, HARRY GEORGE LOREN SON, a citizen of'the United States, and a resident of Newman, county of Stanislaus, and State of California, have invented a new and useful Timer, of which the following is a specification. i

The present invention relates to improvements in spark timing devices and its object is to provide a timer for the Ford automobile that is simple in construction, and in which the points of contact are adjustable so that any wear can be taken up by the turning of a screw. A further object is to provide a timer in which the contact making and breaking parts are in the upper part of the timer housing, so that there is no danger of oil or dirt interfering with the working of the timer.

1 attain these objects by means of the mechanism illustratedin the accompanying drawing, in which Figure 1 represents a front elevation of my timer, Figure 2 a side elevation, Figure 3 a rear elevation, Figure f the same elevation with certain parts removed, Figure 5 a sectional view along line 5-5 of Figure 4, Figure 6 a sec tional view along line 66 of Figure a and Figure 7 a modified form of a wiper.

imilar numerals refer to similar parts throughout the several views.

Referring to the drawing more particular- 1 1 is the driving shaft for the timer of a 0rd engine extending through a circular opening 2 in the front wall of the engine casing 3. An annular ring 1 projects from the front of the casing, coaxial with the opening 3, into the inside of which-fits snugly but rotatably the open bottom of the metallic bell 6 of the timer 7. A short distance from the engine casing the shaft 1 is reduced in size sufficiently to receive a rather heavy sleeve 8, the outer circumfen ence of which is flush with that of the shaft. A circular recess is provided on the inside of the sleeve at the end of the same, into which fits the sleeved nut 9, an inside threadof thelatter engaging a corresponding thread Thus the sleeve 8 can be slipped on the reduced end of the shaft and firmly and rigidly secured in its place by the sleeved nut 11.

A substantially rectangular, vertical box 12 forms a part of the bell 6. This box extends chimneylike through the wall of the bell, a convenient distance above and below the same for the purposes hereinafter described. Both top and bottom of the box are open. Inside the bell this box support-s, parallel to the shaft 1, the shaft 16,011 which pivot wiper bars 21, 22, 23 and 2d, being spaced at equal distances from each other. These bars are held in a substantially vert1-- calposition and are pressed'against the contact points 26,- 27,28 and 29 respectively by means of four two-armed expansion springs 31, one arm of which embraces the upper part of the bar while the other arm bears against a vertical rod 32 mounted in the box heads 36 of coaxial bolts 37 of larger cross section mounted in the wall 38 of the box 12. The wall 38 is made of insulating ma terial- Two nuts 41 and 42 secure the colts 37 in their respective places and are adapted to be used as binding posts for the wires of the electric circuit. Another nut 43 locks the bolt 34 as against the bolt 37.

The contact points 27 and 29 are constructed in substantially the same way as the points 26 and 28, the only difference being that'the smaller bolts are screwed into sleeves mounted in the wall 38 and the sleeves are electrically connected as shown at 14, Figure 6, to the larger bolts 46 secured in the wall 38 below the bolts 37, the only object of this different arrangement being to allow the four contact points to be arranged in one line, while the binding posts on the outside of the casing, being larger in size, project from the four corners of a square, as is plainly shown in Figure 2. It need not be stated that the contact points may be made of any material especially suited for that purpose, like platinum for instance.

The lower parts of the wiper bars 21, 22, 23 and 24L which are slightly curved, as shown in Figure 1, bear against the sleeve 8, which normally keeps the contact open. The sleeve is provided, however, with four transverse grooves 4E7, one of each wiper bar.

Each groove is somewhat wider than its wiper bar, thus providing a convenient path for the same, and it occupies one quarter of the circular surface of the sleeve. The grooves are arranged stepwise. The groove for bar 21 occupyingthe first quarter, the

one for bar 22 the second, and so on. They are of suiiicient depth that as each wiper bar slides over the groove, its opposite end will be actuated by the spring 31 to make contact with one of the contact points 2G, 27, 28 or 29, thus closing the circuit and cans ing a spark in the cylinder to the spark plug of which the respective contact point happens to be connected.

The bell being of metallic material, it will be readily understood that in my timer the circuit is grounded in two ways: tirstly through the shaft 16, on which the four wiper bars pivot, and seconc ly, through the sleeve 8. While either may be relied on for completing the circuit, I prefer to use the one through the shaft 16 alone and, not needing; the other one, 1 embed in the wiping surface of the wiper bars segments of fibre 50 as shown in Figure 7, which at the same time reduces the wear on the wiping surface.

An oil hole 418 and a perikirated lug; h), by means of which the timer may be ad justably connected to the spark lever on the steering wheel, are provided on my timer in the customary way. I also show the spring 51 used for keeping the timer in its place.

I claim:

1. A timer comprising a rotary shalt having a, plurality of transverse grooves evenly distributed over its surface in adjoining; planes, a substantially bell-shaped. housing loosely mounted over the rotor with freedom of rotary motion on the axis of the rotor having an upwardly extending box-like structure communicating therewith, a horizontal shaft mounted above the rotary sha it having a plurality of wiping bars pivotally mounted thereon so that the lower end oi each bar wipes the rotor and a plurality of adjustable contact screws mounted in the box-like structure, the upper end of each wiping bar extending into the latter ucture and being adapted to make contact with one of the screws when its lower end passes over tee groove.

2. A timer comprising a rotarv sha?" ing a reduced end, a sleeve rig lly mounted on said reduced end, aphirality o'l transverse grooves evenly distributed over its surface in adjoining planes, substantially bell-shaped housing loosely mount-ed o er the rotor with lreedon'l of rotary motion on the axis of the rotor having an upwardly extending box-like structure UOIIllllllfilPfltliiQ therewith, a horizontal shaft mounted above the rotary shalt having a plurality oi wipingbars pivotally mounted thereon so that the lower end of each bar wipes the rotor and a plurality of adjustable contact screws mounted in the box-like structure, the upper end c each wiping bar extending: into the latter structure and being adapted to mail-(e contact with one of the screws when its lrnver end passes over the groove.

Hi -i RY GEORGE TJORETJEH) N 

